Tool for bending pipes or figured bars.



A. m'J'L TOOL FOR BENDING PII ES 'OB FIGUBED BARS.

- APPLIUATIOH FILED DEC. 26, 1907.

' "Patented May 23, 1911*.

I A. RfiLF. TOOL FOR BENDING PIPES OR FIGURBD BARS.

APPLIUATION FILED 1120.26, 1907.

* Patented May 23, 1911.

2 SHEETS-SHEET 2.

Witnesses V Inventor" ARI 12:61.1, or BRUs'snL s, BELG UM.

moon FOR nnnnme rrrns on. FiGU'RED BARS.

To all whom, ttmay concern:

Be-it known that I, ARI RI'iLF, a citizen ofv Belgium, residing at Brussels, Belgium,

have invented certain new and useful Improvements in Tools for Bending Pipes or Figured Bars, of which the following is a specification.

This'invention. has for its object a toolfor bending pipes or figured bars of any kind.

Withthe new tool the pipe is bent around' the circumference of the form-piece by a knee-lever consisting merely of two members joined together. The longer member is turnably journaled' in the form-piece, 'while the' short knee-piece jointed to the end of this member presses upon the pipe to be bent firmly and unmovably. When moving this lever, for instance by means of a handle fastened to the rear-prolongation of the short knee-piece, thepipe isby an always increasing knee-lever action pressed down with'great force upon the form-piece, and this force becomes the greater'the more the two united levers approach their respectivedead points, so that shortly before'and after passing the dead point the greatest bending .force is exerted.

The invention is-shown in the accompanying drawings, in which, I

Figure 1 is a side elevation. Fig. 2 is an end View, parts being shown in section.

Fig. 3 is an elevation showing the parts in a diiferent position from that shown in Fig. '1. Fig. 4 is a detail. Figs. and 6 are diagrammatic views. Fig. 7 is a plan view of the modification. Fig. 8 is an elevation thereof, and Fig. 9 is a detail.

The pipe a which is to be bent around the correspondingly figured circumference .of

the form-piece b is jammed in atone point of the circumference by means of the tiescrew 0.- The lever exerting the bending force merely consists of the two parts d and z'. The arm (Z is turnably journaled in the form-piece by means of the. center-bolt f. and is, as shown in Fig. 2, formed by two fish-plates arranged at .both sides of the form-piece, and whose ends are united with eachother by the bolt 9'. On this boltg the shorter arm 2' can be shifted by meansof its slot h. The end of the arm-i firmly sits in a suitable manner against the pipe to be bent, for instance in the form shown in the drawing by means of a block-72, which is provided with a V-shaped' groove for put Specification of Letters Patent." Pat' tg d May Application filed'December. 26, 1907., Serial No. 408,142.

ting it on thepipe, and on the sides with two pins Z. On'these pins Z rests the forkshaped end of the short lever arm i. In this.

way the clamping or jamming-lever finds a supporting point on .the pipe.- If'now this jamming-lever is turned forward inthe direction shown by the arrow'by' means of the handle e provided at its rear end, the pins Z 'form' a fixed pivot on the pipe and the amming-lever causes thearm (Z to turn to a certain extent (Fig. I ;0ns eq c of .this there is caused by the joint movement,

of the arm (land the leverz' a corresponding partial bending of the pipe at around the circumference' of the form-piece. The more the knee-lever consisting of the parts (1 and iapproaches its dead point (Fig. 3) the greater becomes the bending force exerted f on the pipe. This canbe seen more espe-' cially when comparing the 'two-diagrammatic' Figs. 5 and 6, accordingto which the force P, which tends to turn the arm d, is divided, in the direction of the two arms d and a, into two component forces P and P.

The component force P, which represents the pressure exerted on the pipebecornes constantly greater as the bending proceeds.

(Fig. 6) and finally nearly infinitely great,

so thateven the strongest pipescanbe bent byha-nd The 1 flattening of the pipes-which fre- 'quently occurs when they are bent in a. proportionally small circle can-be prevented even without any filling with. sand, or thelike, in a simple way by letting, as shown in Fig. 4, the. lateral borders m of the form-piece section of the pipes. In this way the pipe, enters deeply into the groove, whereby the flattening is made impossible. As soon as project a littlel farther than half the 'c'ross- I the dead point of the jamming lever-work has beenfireached orpassed, the lever :e is turnedback again and the endof the same, that is to say the pressing-piece is, is; set upon another, farther point of the pipe and the described process is repeated. -The slot it allows, if necessary, to lengthen the short arm of thejamming-lever by using pieces which can be inserted into the slot h, .so that, if desired, it is -possible to' advance the same a greatdistance on the pipe, whereby especially with small diameters and bending radii the bending of the pipe up to one or two right angles can be performed by a single movement of the. jamming-lever, Another form ofthe-pipe be 'der, which The form-piece has an octangular projection .is- 'suited for bending pipes of diiferent widths, is illustrated in Figs. 7 to 9. The

form-piece b is provided with grooves a a a,

2 arranged in steps one above the other:

in order to be able'to bend pipes of different diameters on one and the same form-piece,

without having to exchange any parts.

These steps. are'produced by making the bending-radii toward the top smaller according to the smaller diameter of the pipes.

is pivotally journaled the lever-arm cl formed by an upper and a lower fish-plate,

whose ends are united'by the likewise verto secure by United States tical axle 9. On the latter is pivotally journaled the jamming-lever e, a by meaiis 'of a longitudinal slot h, in order to be ab e to lengthen and shorten, as required, the end which is placed upon the pipe. To this end the walls of the slot are provided with grooves 0 at corresponding intervals, into which the wedge-piece p is pushed against which sets the axle g. The jamming-lever isyput upon the pipeby means of the clamping-piece is with a V-shaped groove.

For holding fast the pipe on the formpiece serves the clamping-device formed by the hinge-joints, the bow t and clamping screw 24. The hinge-joint s is fastened to the lower part of the form-piece. In the same is journaled, by means of the bolt o, the bow t-, which ascends on the form-piece and is provided with corresponding grooves, in order to encompass the pipes. It terminates at the top in a vertlcal part against which sets the clamping-screw u. 1 The lat ter sits in a hook-shaped piece a, which is pivotally journaled on the axle f below the upper fish-plate (Z. Owing to .this arrangement the bow can be completely turned up, whereby the inserting and removing of, the pi e is greatly facilitated.

at I claim as my invention and desire Letters Patent 1s:- 1. In a tool for bending pipes or figured bars, a form-piece 12 around the circum ,tially as set forth.

ness and curvature of the the movement of the lever-work the pipe is,

in consequence of the constantly increasing action of the knee-lever, pressed down with great force upon the form-piece, substan- In a tool for bending pipes or figured bars, a short kneepiece i j ournaled by means of a slot h on the end-pin g of the arm (1, in order to allow of puttingthe clampinglever upon the pipe to be bent at a shorter or greater distance, according to the thickpipe, substantially as set forth.

3. A tool for bending pipes comprising a form piece around the circumference of which the pipe is adapted to be bent, a lever (Z pivoted to the form piece, a second lever having a slot intermediate its ends, a pin passing through said slot and carried by the end of the lever (Z, said slot having grooves in. its walls and a wedge fitting in said grooves to hold the pin in any desired position within the slot.

4. A tool for bending pipes comprising a form piece around the circumference of which the pipe is adapted to be bent, a lever d pivoted to the form piece, and a second lever having a movable connection with the first lever intermediate its end, one end of said second lever being adapted to immovably engage with the pipe to be bent.

5. A tool for bending pipes comprising a form piece, a lever a? pivoted thereto, a second lever 6 having a slot intermediate its ends, and a pivot carried by the lever d.

and passing through said slot, one end of the lever 6 being adapted to immovably engage the pipe to'be bent.

In witness whereof I have hereunto set my hand in presence of two witnesses.

ARI RI'FLF.

Witnesses:

Gr. PHELAN, JAMES an G. FAY. 

